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http://dx.doi.org/10.3740/MRSK.2003.13.8.509

Effect of La3＋ and Ce3＋ Ions on Photoluminescence Behavior of YBO3: Tb Phosphors  

On, Ji-Won (Department of Chemistry, School of Advanced Sciences, Dankook University)
Lee, Jeong-Baek (Department of Chemistry, School of Advanced Sciences, Dankook University)
Kim, You-hyuk (Department of Chemistry, School of Advanced Sciences, Dankook University)
Publication Information
Korean Journal of Materials Research / v.13, no.8, 2003 , pp. 509-513 More about this Journal
Abstract
In the present investigation, $La^{3＋}$ and $Ce^{V}$ ions were substituted for $Y^{3＋}$ in the $YBO_3$: Tb in various concentrations. It has been found that these phosphors form solid solutions within limited concentration ranges Excitation and emission spectra under 254 nm and 147 nm were investigated for these phosphors to evaluate influences of $La^{3＋}$ and $Ce^{3＋}$ ions on brightness and CIE color coordinates. It has been observed that brightness of $(Y, La)BO_3$: Tb under 254 nm and 147 nm when $La^{3＋}$ ions are added show an increase of 2.7 times and 1.25 times, respectively. On the other hand, emission intensities of peaks in $Y_{0.8-x}$ $BO_3$: $Tb_{0.2}$ , $Ce_{x}$ show continuos decrease as $Ce^{3＋}$ / content is increased from 0 to 0.4. CIE color coordinates of prepared phosphors show yellowish green which is needed to be improved to be used for display applications.
Keywords
phosphors; borate; lamp; PDP(Plasma Display Panel); luminescence;
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